Effect of radio-frequency interference on the retrieval of land surface temperature from microwave radiation imager

doi:10.6046/gtzyyg.2018.04.14

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Abstract

Radio-frequency interference (RFI) over European land was detected and analyzed using convergence metric of one dimensional variational retrieval (1D-VAR) method and then its influence on the retrieval of land surface temperature (LST) was studied based on FY-3B microwave radiation imager (MWRI) Level 1 measurements conducted. Next, two linear regression equations were proposed to correct RFI-contaminated MWRI data. By comparing the retrieved LST products through 1D-VAR method from MWRI measurements before and after RFI correction, it was found that the convergence metric of 1D-VAR analyzing RFI identification method was effective for the observations over the land. Moreover, retrieved LST which were interfered by RFI were abnormally high with large deviations. And the RFI correction algorithm was used effec tively to improve the inversion precision and the utilization ratio of microwave data. Therefore, it is necessary to effectively identify and correct RFI prior to low-frequency observations with spaceborne microwave imagers to retrieve LST.

Keywords radio-frequency interference (RFI) land surface temperature one dimensional variational retrieval (1D-VAR)

P422.2TP722.6

Issue Date: 07 December 2018

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	Ying WU
	Sulin JIANG
	Zhenhui WANG

Cite this article:

Ying WU,Sulin JIANG,Zhenhui WANG. Effect of radio-frequency interference on the retrieval of land surface temperature from microwave radiation imager[J]. Remote Sensing for Land & Resources, 2018, 30(4): 90-96.

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https://www.gtzyyg.com/EN/10.6046/gtzyyg.2018.04.14 OR https://www.gtzyyg.com/EN/Y2018/V30/I4/90

Fig.1 Comparison of brightness temperatures at 10.65 GHz and convergence metric distributions between those with and without RFI correction based on the MWRI data on 20th July 2014 for ascending orbits

Fig.2 Comparison of brightness temperatures at 10.65GHz and convergence metric distributions between those with and without RFI correction based on the MWRI data on 20th July 2014 for descending orbits

Fig.3 Retrieved land surface temperatures with MWRI observations on July 20th,2014

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